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3 years ago

7

How do I find the atom number

1 answer:

alex41 [277]3 years ago

4 0

The atom number of an atom is the number of protons contained within its nucleus.

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What are the chemical symbols for carbon aluminium hydrogen oxygen and sodium<br>

Elis [28]

El unico que se es el del oxígeno: o2

4 0

2 years ago

What mass of steam at 100°C must be mixed with 119 g of ice at its melting point, in a thermally insulated container, to produce

N76 [4]

Answer: $M=27.92\ gm$

Explanation:

Given

mass of ice $m=119\ gm$

Final temperature of liquid $T_f=57^{\circ}C$

Specific heat of water $c=4186\ J/kg-K$

Latent heat of fusion $L=333\ kJ/kg$

Latent heat of vaporization $L_v=2256\ kJ/kg$

Suppose M is the mass of steam at $100^{\circ} C$

Heat required to melt ice and convert it to water at $57^{\circ}C$

$Q_1=mL+mc(T_f-0)$

Heat released by steam

$Q_2=ML_v+Mc(100-T_f)$

$Q_1$ and $Q_2$ must be equal as the heat gained by ice is equal to Heat released by steam

$Q_1=Q_2$

$\Rightarrow mL+mc(T_f-0)= ML_v+Mc(100-T_f)$

$\Rightarrow M=\dfrac{m[L+c\times T_f]}{L_v+c(100-T_f)}$

$\Rightarrow M=\dfrac{119[333\times 10^3+4186\times 57]}{2256\times 10^3+4186\times (100-57)}$

$\Rightarrow M=119\times 0.2346$

$M=27.92\ gm$

7 0

2 years ago

If the force acting on an object is multiplied by _____, the product is called work

Aneli [31]

The distance the object travels

5 0

3 years ago

Is the sun a transparent object

son4ous [18]

No because it is dense and opaque

7 0

3 years ago

(5 pt) You tie a cord to a pail of water, and your swing the pail in a vertical circular 0.700 m. What is the minimum speed must

Bas_tet [7]

Answer:

The minimum speed required is 2.62m/s

Explanation:

The value of gravitational acceleration = g = 9.81 m/s^2

Radius of the vertical circle = R = 0.7 m

Given the mass of the pail of water = m

The speed at the highest point of the circle = V

The centripetal force will be needed must be more than the weight of the pail of water in order to not spill water.

Below is the calculation:

$\frac{mV^{2}}{R} = mg$

$V = \sqrt{gR}$

$V = \sqrt{9.81 \times 0.7}$

$V = 2.62 m/s$

6 0

2 years ago